Sanni’s system, developed over more than six years in conjunction with students of his over the years, is far more affordable than conventional dryers. Based on the same principle as simply heating grain in a pan over fire, a series of three drums are heated to directly dry out the grains travelling through them. Rollers ensure that grains don’t burn, and the gas heating the system is adjustable at each stage.
As an alternative to drying grains in the sun – a method used by the majority of farmers who cannot afford industrial dryers – the 3-D-3-P dryer is faster and safer. Thousands of Nigerians buy spent grains from local breweries to dry out and use as animal feed – but incur losses through sun drying from animals, and due to fermentation from humidity.
Two pilot machines have been sold, and are being used to dry out sawdust before the high-energy waste product is turned into briquettes for sale to European countries.